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31
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "PngReader.h"
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35
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36 #include "../OrthancException.h"
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37 #include "../Toolbox.h"
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38
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39 #include <png.h>
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40 #include <string.h> // For memcpy()
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41
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42 namespace Orthanc
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43 {
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44 namespace
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45 {
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46 struct FileRabi
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47 {
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48 FILE* fp_;
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49
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50 FileRabi(const char* filename)
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51 {
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52 fp_ = fopen(filename, "rb");
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53 if (!fp_)
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54 {
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55 throw OrthancException(ErrorCode_InexistentFile);
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56 }
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57 }
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58
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59 ~FileRabi()
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60 {
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61 if (fp_)
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62 fclose(fp_);
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63 }
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64 };
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65 }
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66
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67
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68 struct PngReader::PngRabi
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69 {
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70 png_structp png_;
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71 png_infop info_;
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72 png_infop endInfo_;
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73
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74 void Destruct()
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75 {
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76 if (png_)
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77 {
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78 png_destroy_read_struct(&png_, &info_, &endInfo_);
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79
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80 png_ = NULL;
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81 info_ = NULL;
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82 endInfo_ = NULL;
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83 }
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84 }
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85
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86 PngRabi()
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87 {
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88 png_ = NULL;
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89 info_ = NULL;
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90 endInfo_ = NULL;
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91
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92 png_ = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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93 if (!png_)
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94 {
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95 throw OrthancException(ErrorCode_NotEnoughMemory);
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96 }
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97
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98 info_ = png_create_info_struct(png_);
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99 if (!info_)
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100 {
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101 png_destroy_read_struct(&png_, NULL, NULL);
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102 throw OrthancException(ErrorCode_NotEnoughMemory);
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103 }
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104
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105 endInfo_ = png_create_info_struct(png_);
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106 if (!info_)
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107 {
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108 png_destroy_read_struct(&png_, &info_, NULL);
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109 throw OrthancException(ErrorCode_NotEnoughMemory);
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110 }
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111 }
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112
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113 ~PngRabi()
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114 {
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115 Destruct();
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116 }
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117
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118 static void MemoryCallback(png_structp png_ptr,
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119 png_bytep data,
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120 png_size_t size);
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121 };
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122
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123
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124 void PngReader::CheckHeader(const void* header)
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125 {
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126 int is_png = !png_sig_cmp((png_bytep) header, 0, 8);
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127 if (!is_png)
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128 {
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129 throw OrthancException(ErrorCode_BadFileFormat);
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130 }
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131 }
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132
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133 PngReader::PngReader()
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134 {
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135 }
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136
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137 void PngReader::Read(PngRabi& rabi)
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138 {
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139 png_set_sig_bytes(rabi.png_, 8);
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140
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141 png_read_info(rabi.png_, rabi.info_);
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142
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143 png_uint_32 width, height;
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144 int bit_depth, color_type, interlace_type;
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145 int compression_type, filter_method;
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146 // get size and bit-depth of the PNG-image
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147 png_get_IHDR(rabi.png_, rabi.info_,
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148 &width, &height,
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149 &bit_depth, &color_type, &interlace_type,
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150 &compression_type, &filter_method);
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151
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152 PixelFormat format;
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153 unsigned int pitch;
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154
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155 if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 8)
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156 {
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157 format = PixelFormat_Grayscale8;
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158 pitch = width;
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159 }
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160 else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth == 16)
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161 {
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162 format = PixelFormat_Grayscale16;
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163 pitch = 2 * width;
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164
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165 if (Toolbox::DetectEndianness() == Endianness_Little)
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166 {
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167 png_set_swap(rabi.png_);
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168 }
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169 }
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170 else if (color_type == PNG_COLOR_TYPE_RGB && bit_depth == 8)
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171 {
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172 format = PixelFormat_RGB24;
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173 pitch = 3 * width;
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174 }
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175 else if (color_type == PNG_COLOR_TYPE_RGBA && bit_depth == 8)
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176 {
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177 format = PixelFormat_RGBA32;
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178 pitch = 4 * width;
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179 }
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180 else
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181 {
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182 throw OrthancException(ErrorCode_NotImplemented);
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183 }
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184
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185 data_.resize(height * pitch);
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186
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187 if (height == 0 || width == 0)
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188 {
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189 // Empty image, we are done
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190 AssignEmpty(format);
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191 return;
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192 }
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193
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194 png_read_update_info(rabi.png_, rabi.info_);
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195
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196 std::vector<png_bytep> rows(height);
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197 for (size_t i = 0; i < height; i++)
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198 {
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199 rows[i] = &data_[0] + i * pitch;
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200 }
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201
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202 png_read_image(rabi.png_, &rows[0]);
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203
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204 AssignReadOnly(format, width, height, pitch, &data_[0]);
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205 }
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206
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207 void PngReader::ReadFromFile(const char* filename)
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208 {
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209 FileRabi f(filename);
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210
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211 char header[8];
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212 if (fread(header, 1, 8, f.fp_) != 8)
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213 {
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214 throw OrthancException(ErrorCode_BadFileFormat);
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215 }
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216
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217 CheckHeader(header);
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218
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219 PngRabi rabi;
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220
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221 if (setjmp(png_jmpbuf(rabi.png_)))
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222 {
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223 rabi.Destruct();
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224 throw OrthancException(ErrorCode_BadFileFormat);
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225 }
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226
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227 png_init_io(rabi.png_, f.fp_);
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228
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229 Read(rabi);
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230 }
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231
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232
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233 namespace
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234 {
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235 struct MemoryBuffer
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236 {
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237 const uint8_t* buffer_;
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238 size_t size_;
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239 size_t pos_;
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240 bool ok_;
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241 };
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242 }
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243
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244
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245 void PngReader::PngRabi::MemoryCallback(png_structp png_ptr,
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246 png_bytep outBytes,
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247 png_size_t byteCountToRead)
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248 {
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249 MemoryBuffer* from = reinterpret_cast<MemoryBuffer*>(png_get_io_ptr(png_ptr));
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250
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251 if (!from->ok_)
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252 {
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253 return;
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254 }
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255
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256 if (from->pos_ + byteCountToRead > from->size_)
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257 {
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258 from->ok_ = false;
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259 return;
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260 }
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261
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262 memcpy(outBytes, from->buffer_ + from->pos_, byteCountToRead);
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263
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264 from->pos_ += byteCountToRead;
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265 }
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266
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267
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268 void PngReader::ReadFromMemory(const void* buffer,
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269 size_t size)
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270 {
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271 if (size < 8)
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272 {
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273 throw OrthancException(ErrorCode_BadFileFormat);
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274 }
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275
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276 CheckHeader(buffer);
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277
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278 PngRabi rabi;
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279
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280 if (setjmp(png_jmpbuf(rabi.png_)))
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281 {
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282 rabi.Destruct();
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283 throw OrthancException(ErrorCode_BadFileFormat);
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284 }
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285
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286 MemoryBuffer tmp;
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287 tmp.buffer_ = reinterpret_cast<const uint8_t*>(buffer) + 8; // We skip the header
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288 tmp.size_ = size - 8;
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289 tmp.pos_ = 0;
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290 tmp.ok_ = true;
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291
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292 png_set_read_fn(rabi.png_, &tmp, PngRabi::MemoryCallback);
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293
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294 Read(rabi);
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295
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296 if (!tmp.ok_)
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297 {
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298 throw OrthancException(ErrorCode_BadFileFormat);
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299 }
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300 }
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301
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302 void PngReader::ReadFromMemory(const std::string& buffer)
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303 {
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304 if (buffer.size() != 0)
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305 {
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306 ReadFromMemory(&buffer[0], buffer.size());
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307 }
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308 else
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309 {
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310 ReadFromMemory(NULL, 0);
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311 }
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312 }
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313 }
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